PT98368B - PROCESS AND INSTALLATION FOR THE MANUFACTURE OF BARRELS WITH COVER AND LARGE COLUMN BARRIERS - Google Patents

Abstract

The process for manufacturing barrels, developed with the aim of dimensional accuracy of the injection-moulded heads and blow-moulded barrel bodies, is characterised by the blow-moulding of double-barrel bodies from plastic and central splitting of the same into two barrel bodies, the injection-moulded production of bung-type heads from plastic, the cooling of the barrel bodies and of the bung-type heads to fitting form in cooling and calibrating sections downstream of the blow-moulding machine for producing the double-barrel bodies and the injection-moulding machine for the barrel heads, and the welding of the bung-type heads to the barrel bodies. …<??>The process for manufacturing wide-necked vessels provides for the blow-moulding of double-vessel bodies from plastic and central splitting of the same into two vessel bodies each having a border arranged at a distance below the vessel opening, the injection-moulded production of vessel lids from plastic, with an outer flange moulded onto the lower lid rim, the cooling of the vessel bodies and of the vessel lids to fitting form in cooling and calibrating sections downstream of the blow-moulding machine for producing the double-vessel bodies and the injection-moulding machine for the vessel lids, the injecting of a sealing compound of plastic into the lids and the setting of the lids onto the vessel bodies and closing of the lids with a clamping ring. …<IMAGE>…

Description

Description referring to Schutz-Werke GmbH & Co. KG, German, industrial and commercial patent, based at Bahnhofstrasse 25, D-5418 Selters, German Federal Republic, (inventor: Udo Schutz, residing in Germany), for PROCESS AND INSTALLATION FOR THE MANUFACTURE OF KEGS WITH CAP AND LARGE COLLAR KEGS ”.

description

The present invention relates to a process for the manufacture of barrels with a plug and wide-necked barrels of plastic material.

The placement of the plastic injection molded lid, which is stored in an intermediate deposit, in the body of the barrel molded by blowing plastic material, in the case of the manufacture of wide-necked barrels, often presents difficulties, since the lid and the body of the barrel, due to the dimensional deviations that appear in the processing of plastics, depending on several factors in the pieces of plastic material, in particular the different contraction of the plastic pieces when they cool down after blowing and injection, do not adjust exactly.

The problem of the lack of stability in the dimensions of the pieces of plastic material to be connected also appears in the manufacture of plastic barrels with a plug, in which the side surface of the blow-molded barrel is welded with the lid and the bottom of the barrel, that are manufactured on machines

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injection molding and stored in intermediate tanks.

The lack of stability in the dimensions of the plastic parts leads, in the case of the manufacture of bread-sized barrels and wide-necked barrels, to a relatively high scrap rate. Another drawback in the manufacture of buffer or wide-neck barrels of plastic material is found in the deficient production flow, due to the intermediate storage of lids and bottoms which, due to the necessary storage space and internal transport, or between services , required from the caps and bottoms of injection molding machines for the warehouse and from there to the workshop for manufacturing the barrel bodies, leads to an increase in manufacturing. Another drawback lies, in the case of the manufacture of barrels with a plug, in the molding of special bottoms by injection, which makes the product more expensive.

The present invention has as its object a process for the manufacture of barrels with a plug and wide-necked barrels of plastic material that ensures stability in dimensions of the injection-molded lid and the blow-molded barrel body and provide facilities that work by this process. only with a higher production yield.

According to the present invention, this problem is solved by a process for the manufacture of barrels with a plug, which is characterized by making the blow molding of double bodies of barrels of plastic material, their separation in the middle to obtain two bodies of barrel, the manufacture, by injection molding, of plastic barrel caps, the cooling of the barrel body and the barrel cover to obtain an adjusted shape in cooling and calibration sections, located after the blow molding machine and of the injection molding machine of the caps of the barrels, and the welding of the caps with the bodies of the barrels.

Another essential feature of the wide neck barrel manufacturing process is that the barrel lid is injection molded with an excessive dimension of the lower edge of the lid and that, after passing through the sections

for cooling and calibration, the annular section of the lower edge of the protruding lid, in addition to the nominal measurement of the height of the lid, is cut to prepare a surface for welding on the lower edge of the lid, without the oxide film that forms when molding the lid by injection.

After welding the cap with a plug with the barrel body, the area of the welding joint is heated to eliminate welding stresses by applying a flame.

The process provided by the present invention for the manufacture of wide-necked barrels provides for the manufacture by blowing double barrel bodies of plastic material and dividing them in half to obtain two barrel bodies, each with a rim formed at a certain point. distance from the barrel opening, injection molding manufacture of plastic barrel caps with an outer flange formed at the bottom edge of the lid, cooling of the barrel bodies and lids to obtain an adjustment shape in cooling sections and calibration, placed after the blow molding machine for the manufacture of barrel bodies and the injection molding machine for barrel lids, the introduction of a sealing compound of plastic material in the lid, the placement of the lid in the barrel body and closing the lid with a tensioning ring.

The core idea of the present invention is, in the case of the two processes for the manufacture of barrels with caps and wide-necked barrels, the cooling of the barrel bodies and the caps to obtain forms of adjustment in the cooling and calibration sections placed afterwards the barrel body blow molding machine and the barrel cap injection molding machine. This measurement of manufacturing technique in the context of a continuous production process creates the assumption for the precise welding of barrel caps with barrel bodies in the case of the manufacture of barrels with a buffer and a precise and adjusted fit of the cap on the barrel body in the In the case of the manufacture of wide-necked barrels, it takes care of a considerable improvement in the quality of the barrels and reduces to a minimum the rate of

- refuse. The blow molding of the double barrel bodies and the association of the manufacture of the barrel bodies and the barrel caps in a continuous manufacturing process, without intermediate storage of the barrel bodies or caps, lead to a substantial increase in production, in comparison with the well-known manufacturing processes of capped and wide-necked barrels and a reduction in production costs by saving personnel and storage space and eliminating the transport of parts to the intermediate warehouse and from there to the final manufacture.

The present invention is described in more detail below, based on two facilities for the manufacture of barrels with a plug and of large-necked plastic barrels. In the attached drawings, the figures represent schematically:

Fig. 1, a schematic of a plant installation for the manufacture of barrels with a plug;

Fig. 2, the cooling and calibration sections for the barrel bodies of the installation according to fig. 1;

Fig. 3, an enlarged fragmentary representation of the cooling and calibration section for the barrel covers of the installation according to fig. 1; and

Fig. 4, a plan view of a facility for the manufacture of wide-necked barrels.

The main components of the installation according to fig. 1 to 3 for the manufacture of barrels with plug are a machine (1) for blow molding of double barrel bodies (2) of plastic material, a cutting device (3) for the middle operation of the double barrel bodies (2) on two barrel bodies (4), an injection molding machine (5) for the manufacture of barrel caps (6) of plastic material, cooling sections (7.8) of the barrel bodies (4) and the barrel covers (4) placed after the blow molding machine (1) and the injection molding machine (5), a working machine (9) adjacent to the cooling sections e. calibration tool (8) for the barrel caps (6), to cut in the

exact measurement of the bottom edge of the lid and to cut the residual material from the injection into the injection molding machine (5), two welding machines (10) to weld the barrel caps (6) to the barrel bodies (4), a machine (11) for heating the area of the welding joint of the barrels (13) by means of a flame, a device (14) for checking the tightness of the barrels with a plug (13), a marking device (15), a transverse conveyor (16) for the extraction of defective barrels, a cooking device (17) and a receiving station with conveyor tape (18).

The double bodies (2) of barrels manufactured in the blow molding machine (1) from granulated plastic material are transported by a robot (19) to the cutting device (3), in which the double bodies (2) barrels are divided, by cutting a middle ring containing the blow opening of the blow nozzle, into two equal barrel bodies (4). The barrel bodies (4) are carried by the robot (19) from the cutting device (3) to a weighing device (20).

The overweight barrel bodies are separated and passed to a conveyor belt (21), carried by the robot (19), being carried by the conveyor belt, together with the rings removed as scrap in the cutting device (3), to a mill cutting (22), the conveyor tape (21) being used as a cooling section for the waste material which is cut at temperatures of 60 to 70 ° C. A suction device (23) transports the granulate produced by a cutting mill (22) to crushed material silos (24). The ground material (24) from the silos (24) is mixed with fresh granules from the raw material silos (25) and the mixture of the granules is taken to the blow molding machine (1). The robot (19) carries the barrel bodies (4) with the weights prescribed for the cooling and calibration section (7).

The cooling and calibration section (7) according to fig. 2 presents a bottom endless conveyor (26) with cooling and calibration bases (27) for receiving the barrel colors (4) in the right position (4 ') and a conveyor

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upper screw and compression plates (29) to hold the barrel bodies (4) in the calibration bases (27), the endless conveyors (26) and (28) being formed as chain conveyors. The lower endless conveyor (26) extends into the inlet feeding zone (30) and in the extraction zone (31) through the ends of the upper endless conveyor (28), so that in the entrance zone ( 30) there is enough space for the robot (19) to seat a barrel body (4), in the right position (4 ') on a calibration base (27), before a compression plate (29) of the endless conveyor (28) rest on the barrel bottom (32). In the same way, there is space in the extraction zone (31) for an extraction and turning device (33), to remove a barrel body, after passing through the cooling and calibration sections (7) and the body release. barrel by the compression plate (29) that rests on the respective bottom (32) of the barrel, the upper endless conveyor (28), the calibration base (27) and transfer the barrel body (4), lying down and with the longitudinal axis in the direction of transport, on a transverse conveyor (34). A longitudinal carrier (35), formed as a chain carrier, receives the barrel body (4) now lying, perpendicular to the direction of transport, from the transverse carrier (34) and transports it to two symmetrical welding machines (10) some arranged. after the other.

The barrel bodies (4), which enter the cooling and calibration section (7) with a side surface temperature of about 50 - 60 ° C, are transported in a cadence over a period of time of about 30 m from the station stop at stop point, through the cooling and calibration section (7) and cool to room temperature. At the stop points located one after the other, the barrel bodies (4) are blown with the cooling air. The heat dissipation of the barrel bodies is then done mainly by convex and thermal conduction, through the calibration bases (27) and the aluminum compression plates (29) with a high coefficient of thermal conductivity. By cooling the barrel bodies (4) on the calibration bases

(27) it is achieved that the diameter of the opening edge of the barrel bodies (4) that leave the cooling and calibration section (7) coincides with the diameter of the lower edge of the barrel caps (6) obtained in the molding machine by injection (5), after they have passed through the cooling and calibration section (8).

The construction and mode of operation of the cooling and calibration section (8), where the barrel caps (6) injection molded in the machine (5) are transferred by a robot (36), are analogous to the construction and the mode of operation of the cooling and calibration section (7) of the barrel bodies (4). The cooling and calibration section (8) according to fig. 3 shows a lower endless conveyor (37) with lower cooling and calibration plates (38) and an upper endless conveyor (39) with upper cooling and calibration plates (40) for tightening the barrel cover (6). The upper and lower endless conveyors (37,39) are formed as chain conveyors.

In the working machine (9) after the cooling and calibration section (8), the material residues from the injection molding of the barrel caps (6) are cut and the annular section of the lower edge of the cap that exceeds the measurement the nominal height of the molded cap with an excessive measure, for preparing a welding surface at the bottom edge of the cap, without the oxide film formed on the cap in injection molding. Said material residues and rings are taken to the conveyor tape (21), with a tape conveyor (41) and from there, together with the waste products resulting from blow molding and cutting of the double barrel bodies (2 ) for the cutting mill (22).

Two linear gantry robots (42,43) transport the barrel caps (6) from the working machine (9) to the two symmetrical welding machines (10), in which the barrel caps (6) are welded, perfectly adjusted , with the barrel bodies (4) that come from the cooling and calibration section (7).

When welding the bottom edge of the lid, without oxide film, with the barrel body without oxide film obtained in the cutting device (3) by separating the double barrel body (2), a homogeneous welding joint is formed, with lasting resistance and resistant to the formation of cracks due to stresses.

It is possible to provide buffer zones for barrel bodies (4) and barrel caps (6) before symmetric welding machines (10).

A longitudinal conveyor (44) formed as a trans. chain carrier transports the capped barrels (13) from the symmetrical welding machines (10) to the working machine (11) that cuts the excess welding seam in the capped barrel and from there, through the device (12) for heating from the welding zone of the barrel by means of a flame to eliminate welding stresses, to a turning device (45) that transfers the barrel, in the right position, to another conveyor tape (46) orientates longitudinally.

The conveyor belt (46) then transports the barrel (13) to the checking device (14), in which the barrel is tested to check its tightness, hence to the marking device (15) in which the barrel receives a run number of production and a mark of the firm, then passes through the conveyor (16) to extract the defective barrels to the cooking device (17), in which it is closed with the screw cap, and eventually even specially equipped for the customer, and from there to the extraction station (18) at the end of the conveyor belt (46).

Ready-made kegs are, prior to transport to the buyer, preferably placed on pallets, in a pallet packaging device, are represented and can be packed, if necessary, in an appropriate device, also not represented, to form units of various pallets.

The main parts of an installation according to

fig. 4, for the manufacture of wide-necked barrels are a machine (47) for blow molding double barrel bodies (48) of plastic material, a cutting device (49) for separating the double barrel bodies in half (48) in two barrel bodies (50), each with a rim at a certain distance below the barrel opening, an Injection molding machine (51) for the manufacture of barrel caps (52) of material plastic, cooling and calibration sections (53,54) arranged after the blow molding machine (47) and the injection molding machine (51), for the barrel bodies (50) and the barrel caps (52 ), a machine (55) for separating material waste from the barrel caps (52) from the injection molding, a machine (56) for injecting a plastic sealing material into the cap (52) and a drying device following it, as well as a mounting frame (58) for the laying the lid (52) on the barrel body (50) and closing the lid with a tensioning ring. In the manufacture of wide-necked barrels with an inner lining, the barrel bodies (50), in the assembly frame (58), are equipped with a flexible inner lining of plastic sheet or a composite sheet of metal and plastic.

The double barrel bodies (48) manufactured in the blow molding machine (47) from granulated plastic material are transported by a robot (59) to the cutting device (49), in which the double body of the barrels (48) in two equal barrel bodies (50). The barrel bodies (50) are carried by the robot (59) from the cutting device (49) to a weighing device (60). The overweight barrel bodies are separated and transferred by the robot (59) to a tape conveyor (61), which takes the overweight bodies along with the plastic material rings obtained in the cutting device (49) , for a cutting mill (62). A suction device (63) transports the granulate produced in the cutting mill (62) to silos of the ground product (64) to be reprocessed into a mixture with fresh granulate. The robot (59) carries the barrel body (50) with the prescribed weight for the cooling and calibration section (53), whose construction and function mode

operation are analogous to the construction and operation of the cooling and calibration installation (7) of the aforementioned installation for the construction of barrels with a plug.

After passing through the cooling and calibration section (53), the barrel bodies (50) are transferred by an extraction and turning device (65) to a conveyor belt that takes the barrel body to the mounting frame (58 ).

The covers (52) that leave the injection molding machine (51) are taken by a robot and inserted in the cooling and calibration section (54), similar to the cooling and calibration section (8) of the installation described for the manufacture of barrels with buffer. In the preparation machine (55) adjacent to the cooling and calibration section (54) the material residues resulting from the injection molding of the lids are cut, which, together with the residues produced with the cutting device (49) and the barrels of the blow molding machine (47), are transported to the cutting mill (62). From the brewing machine (55), the barrel caps (52) are transferred to the injection molding machine (56), with which a two-component plastic sealing compound is injected into the cap. From the injection molding machine (56), the lids are transported with a conveyor tape (68) to the drying device (57), in which the reaction initiated in the transport path between the injection machine and the drying device ends. and an added curing agent. On the mounting frame (52) the barrel lids (52) removed from the drying device (57), are seated on the barrel bodies (50) - possibly after the placement of an inner lining - and the barrel lid is closed with a tensioning ring.

The finished wide-necked barrels (69) are, after being marked, placed on pallets and the pallets with barrels can, if necessary, be grouped into packages with several barrels.

Claims (1)

Process for the manufacture of barrels with breadboard made of thermoplastic synthetic material, characterized by comprising the blowing of double barrel bodies of plastic material and the separation of them in half to obtain two barrel bodies, the manufacture by injection molding of lids of closing of plastic material, the cooling of the barrel bodies and the closing lids in calibration molds, in cooling and calibration sections arranged after the blowing machine for the manufacture of the double barrel bodies and the injection molding machine for the closure caps, and the welding of the closure caps on the barrel bodies. 2. Process according to claim 1, characterized in that the closure caps are poured by injection with an oversize of the lower edge of the cover and that, after passing through the cooling and calibration sections, the annular section protruding over the height is cut nominal size of the bottom lid of the same for the preparation of a welding surface on the lower edge of the lid without the oxide film that forms when injection molding the lid. _ 3rd _ Method according to claims 1 and 2, characterized in that, after welding the closure cap and the barrel body, the area of the welding joint is heated to eliminate the welding stresses. - 4th _ Process according to claim 3, barrel aging. Process for the manufacture of wide neck barrels of thermoplastic material, characterized by comprising the blowing of double barrel bodies of plastic material and the separation of them in half to obtain two barrel bodies, each one with a rim formed at a certain distance from the barrel opening, injection molding manufacture of plastic barrel caps with an outer flange formed at the bottom edge of the lid, the cooling of barrel bodies and barrel caps in cooling and calibration sections in a mold of calibration, which are arranged after the blowing machine for the manufacture of the double barrel bodies and the injection molding machine of the barrel covers, the injection of a material sealing mass in the cover and the placement of the covers in the bodies of barrel and cap feeho with a tensioning ring. Process according to claim 5 for the manufacture of wide-necked barrels with inner lining, characterized by the placement of a flexible inner lining of a sheet of plastic material or a composite sheet of metal / plastic in the barrel bodies, prior to placement cover. Installation for the manufacture of barrels with a plug according to the process of claims 1 to 4, characterized by comprising a machine (1) for blowing double barrel bodies (2) of plastic material, a cutting device (3 ) to separate the half barrel bodies (2) in half to obtain two barrel bodies (4), a - «w,. ·» · -. injection molding (5) for the manufacture of plastic closure caps (6), cooling and calibration sections (7.8) placed after the blowing machine (1) and the injection molding machine (5) for the barrel bodies (4) and the lids (6), a processing machine (9) after the cooling and calibration section (8) for the lids (6), for cutting with the exhaust dimension from the bottom edge of the covers and to cut the irregularities of the castings, a welding machine (10) for welding the covers (6) with the barrel bodies (4), a machine (11) for the treatment of the welding joint , a device (12) for heating the zone of the welding joint of the barrels with plug (13) and a device (14) for checking the tightness of the barrels (13). - 8§ Installation for the manufacture of wide neck barrels according to the process of claims 5 and 6, characterized in that it comprises a machine (47) for blowing double barrel bodies (48) of plastic material, a cutting device (49 ) for the separation, in the middle, of the double barrel bodies (48) to obtain two barrel bodies (50) each with a rim formed at a certain distance below the barrel opening, an injection molding machine (51 ) for the manufacture of barrel covers (52) made of plastic material, cooling and calibration sections (53.54) placed after the machine. blow molding machine (46) and the injection molding machine (51) for the barrel bodies (50) and the barrel caps (52), a machine (56) for injecting a plastic sealing material into the caps (52) and a drying device (57) placed after this last machine, and a mounting bracket (58) for placing the covers (52) on the barrel bodies (50) and closing the covers with a tensioning ring. - 9- 13 - Installation according to claim 8 for the manufacture of wide-necked barrels with inner lining, characterized in that it comprises a mounting bracket (58) for providing the barrel bodies (50) with a flexible inner lining of plastic sheet or a composite metal / plastic sheet. Installation according to any of claims 7 to 9, characterized in that the cooling and calibration section (7) for the barrel bodies (4) has a lower endless carrier (26) with cooling and calibration bases (27) for the reception of the barrel bodies (4), in the upside-down position (4 '), and an upper endless conveyor (28) with pressure plates (29) to hold the barrel bodies (4) on the calibration bases (27). - 113 Installation according to any of claims 7 to 10, characterized in that the cooling and calibration sections (8) for the barrel lids (6) have a lower endless conveyor (37) with lower calibration and cooling plates and an upper endless conveyor (39) with calibration plates and upper cooling (40) for fixing the covers (6). Installation according to claims 10 and 11, characterized in that the lower endless conveyor (26; 37) of the cooling and calibration sections (7,8) is deflected outwards in the entry and exit zone (30,31), in relation to the ends of the upper conveyor (28; 39). 14 - 13 ^â Installation according to instructions 10 to 12, characterized by the fact that they are built as conveyors with any of the endless chain conveyors (26,28; 27,39). The applicant claims the priority of the German patent application filed on July 19, 1990, under N2. P 40 22 926.2.